/* 头部样式 */
.header {
    background-color: #001529;
    padding: 0 20px;
    height: 50px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav {
    display: flex;
    align-items: center;
    flex: 1;
}

.nav-item {
    color: #fff;
    text-decoration: none;
    padding: 0 20px;
    height: 50px;
    line-height: 50px;
    transition: background-color 0.3s;
}

.nav-item:hover {
    background-color: #1890ff;
}

.nav-item.active {
    background-color: #1890ff;
}

.logo {
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    margin-right: 30px;
    text-decoration: none;
}